ES2285337T3 - HEAT EXCHANGER WITH OPEN PROFILE AS ACCOMMODATION. - Google Patents

Abstract

Heat exchanger, consisting of flat tubes (3) that have wide and narrow sides (33, 32), whose tubes are arranged relatively together forming channels (10), in which for example a gas, such as a gas exhaust or supply air, flows through the flat tubes (3) and is then cooled through a cooling medium, which flows through the channels (10) between the flat tubes (3), and whose exchanger has a housing (11) in which a stack of flat tubes (3) is arranged, characterized in that the housing (11) is made as an open profile with two wings (12, 13) having a joining edge (20), whose housing only part of the entire perimeter of the stack (s) of flat tubes (3) surrounds, in which the flat tubes (3) are kept separate and the channels (10) are closed to the open side and the edge of junction (20) is connected to the wide sides (33) or narrow sides (32) of the outer flat tubes.

Description

Heat exchanger with open profile as accommodation.

The invention relates to an exchanger of heat, consisting of flat tubes that have wide sides and narrow, whose tubes are arranged relatively together forming channels, in which for example a gas, such as a gas of exhaust or feed air, flows through the flat tubes and it is then cooled through a cooling medium, which flows to through the channels between the flat tubes, and whose exchanger it has a housing in which a stack of tubes is arranged blueprints.

A heat exchanger of this type is described in the recently filed European patent application and not yet published with application number EP 04 019 339.3. Here it is especially a heat exchanger for gas Exhaust that must have a 4 'bypass. To explain the housing 11 'shown in figures 9 and 10 there, figure 10 was added as figure 1 to this application and was endowed with the "State of the art" indication. The accommodation 11 ' it comprises there the entire perimeter of the stack of flat tubes 3 ', as Make a clear look at the figures. In addition to that, the tubes 3 'planes are not deformed there on their wide sides 33'. The 10 'channels have been formed there by insert pieces.

The task of the present invention consists in further simplify the heat exchanger in relation to its construction, in which the heat exchanger may be performed either with or without derivation.

The solution according to the invention is produced in a heat exchanger corresponding to the preamble with the characterizing properties of claim 1.

The accommodation is shaped as a profile open with two wings, which only surrounds a part of the perimeter of the stack of flat tubes, in which the surrounded part encloses approximately three sides of the perimeter but at least more than 50% up to 90% of the full perimeter. The flat tubes are kept separated, to form the channels. The channels are closed out, to the side not surrounded by accommodation. For it,  flat tubes preferably have a section enlargement transverse continuous in the longitudinal direction. Not preferred, but it is feasible to have for this function instead of the cross-sectional extension an additional piece between flat tubes The construction has been simplified by it additionally, since such a housing can be manufactured in a manner considerably simpler, as it can be seen, said in large features, like a sheet with two parallel folded flanges. The flat tubes can also be inserted or mounted so considerably simpler in such accommodation.

A referral may or may not be provided, depending on the application case, in the part, not surrounded by the accommodation, of the perimeter of the stack of flat tubes. It is not ruled out that the non-surrounded part may be covered in another application case by a separate lid. Preferably, this part is made however without cover of any kind.

The wings preferably extend in the direction of the wide sides of the flat tubes and are joined with the wide sides of the outer flat tubes of the stack. In a case of non-preferred application, the wings extend in the direction of the narrow sides of the flat tubes, leading to then connect to the narrow side of a flat tube.

In the case of preferred application, the tubes planes have an enlarged cross section that extends in the longitudinal direction of the same, whose extension are joined wings preferably with the wide sides of the tubes blueprints.

The cross section enlargement may be provided on one or preferably on the two wide sides of the flat tubes This extension extends as strips over all the length of the flat tubes.

The wings of the housing have an edge of union, which is preferably lowered and assumes the union preferably with cross section enlargement. Between housing and the wide side of the outer flat tube has been formed thereby also a channel for the cooling medium.

All flat tubes are made of one piece or two pieces and are arranged one above the other, leaving intermediate spaces that form the channels, in which the channels or respectively the intermediate spaces are formed by the resource that flat tubes are in contact with each other preferably with its cross-sectional extension. In tubes planes made of two pieces a procedure of indirect welding for metal bonding. If on the contrary One-piece flat tubes are provided, these are made preferably as welded welded flat tubes, which are manufactured on manufacturing trains themselves known from sheet metal.

For example, a longitudinal weld can be arranged on one of the two narrow sides. The extension of cross section is carried out in the course of manufacturing flat tubes described.

In two-piece flat tubes there can be two identical or different deformed plates, in which the channels are formed by the deformation of the plates.

There is an inlet collector tank and preferably also a separate outlet collecting tank for the gas.

One side of housing and deposits collectors are equipped with receiving moldings for the segment corresponding of the joint edge of the flat tubes. The pipes planes preferably have an inner insert. The insert inside is a corrugated sheet, whose undulations form preferably discrete flow passages for the gas.

Through the inserted inner insert and by means of a separating plate in the inlet collecting tank or respectively output the aforementioned branch can be formed inside the flat tubes.

This has the non-insignificant advantage that at least the flow passage, which limits with the derivation, of the inner insert essentially is not pierced by gas, with what that the passage of heat is suppressed. Exhaust gas flowing to Bypass should not be cooled essentially.

In relation to other properties it is done reference to the other subordinate claims. The invention It is described below according to embodiments. Starting properties and advantages can be derived from this description additional, which can be revealed later as particularly important.

Figure 1 shows a state of the art not previously published;

Figure 2 a view on an exchanger of hot;

Figure 3 a perspective view on a disassembled stack of flat tubes;

Figures 4 and 5 perspective views on a mounted heat exchanger;

Figure 6 a side view of a heat exchanger;

Figure 7 a top view on a heat exchanger with inlet collector tank and exit;

Figure 8 a perspective view of a flat tube part;

Figure 9 a cross section of a tube one piece plan;

figure 10 a cross section of another flat tube of one piece;

Figures 11-14 embodiments perfected heat exchangers in representations in perspective;

Figures 15 and 16 two cross sections with various two-piece flat tubes;

Figures 17-22 views in perspective on heat exchangers according to the figures 16 and 17, drawn with and without collecting tanks;

Figure 23 shows flat tubes, which only They have an enlarged cross section on a wide side.

The embodiments shown in the Figures refer to heat exchangers for exhaust gas, cooled by the combustion engine coolant internal, for a motor vehicle, which are included so known and not shown in a gas recirculation system of escape, which should not however result in any limitation in relation to it.

In the exemplary embodiments shown are stacked on each other simply three or respectively four flat tubes 3 and are respectively provided with a collecting tank 21, 22 (figures 7, 21, 22) on the front sides of the heat exchanger. The number of flat tubes 3 is free, it orient respectively according to the needs of the case of particular application

In the embodiments according to the Figures 2 to 14 have used flat tubes 3 of a piece, which They have been manufactured preferably from stainless steel sheet Weldable by indirect welding. In the case of an exchanger of heat for for example feed air is used sheet metal aluminum. In the cited examples of embodiment it has been formed in the two wide sides 33 of each of the flat tubes 3 respectively an extension of cross section 14, which is extends over the entire length of the flat tubes 3. The tubes 3 planes are manufactured on known manufacturing trains to starting from continuous sheet metal, in which preferably in one of the narrow sides 32 provide a longitudinal weld 37. Two different structures of flat tubes 3 are represented in figures 9 and 10. According to figure 9, the cross section enlargement 14 has been shaped so relatively wide and extends to the narrow side 32, in the Figure 9 narrow side 32 located on the right. A part of this flat tube 3 has also been represented in figure 8 as perspective view. Unlike this, flat tubes 3 according to figure 10 they have an enlarged cross section 14, which does not reach the narrow side 32, in which the extension of cross section 14 represented as a longitudinal strip continuous is also narrower than the one in figure 9.

What is in principle also possible to lead to perform cross section enlargement 14 only in one of the wide sides 33 of the flat tubes 3 and form the stack from of such flat tubes 3, it is indicated in figure 23 by only two flat tubes 3. The height of the channel 10 can be determined naturally by the height of step 14 (extension of cross section). In such cases something else can be lowered strongly the joint edge 20 of the housing 11, to obtain the desired width of the outer channel 10. The housing 11 has been indicated there simply by a line of dots and stripes. Possibly they are also advantageous however applications in the that an external channel 10 can be renounced, so that it is not necessary a recess of the joint edge 20.

For example, figures 5 or 11 show that the accommodation 11 is made as an open profile with two wings 12, 13, which only surrounds a part of the total perimeter of the tube stack planes 3, in which the surrounded part is clearly greater than half of the total perimeter. The two wings 12, 13 extend approximately parallel from a base section 15 of the housing 11. The two wings 12, 13 preferably have the same length. Channels 10 between flat tubes 3 are closed by extending cross section 14 to the side Open housing 11 in the drawings shown.

In Figure 5 flat tubes 3 have been used shown in figure 10. In figure 11 they have been employed flat tubes 3 shown in figure 9, in which the size of cross section enlargement 14 has been reduced somewhat by comparison with said figure. Accommodation 11 surrounds in the heat exchanger of figure 11 approximately three sides of the stack of flat tubes 3, namely one of the sides formed by the narrow sides 32 and the two sides formed by the wide sides 33. The other side formed by narrow sides 32 is left without another cover. In contrast, the wide sides 33 in Figure 5 they are not completely surrounded but only for the most part by two wings 12, 13 of the housing 11. The two wings 12 and 13 have a binding edge 20 lowered. This one serves for the union to the extension cross section 14 of the wide side 33 of the flat tubes 3 externally located but also for the union in the area of the flat tube ends 35.

As they make clear, for example, figures 3, 4 and 8, the ends 35 of the flat tubes 3 are shaped, to bring your wide sides 33 in this area to be completely in Contact. A plate of tubes, in whose openings the tube ends, does not exist in the embodiments shown. The drawings show that the degree of conformation of the flat tube ends 35 is quite small, so that to this In this regard, it is not necessary to make particular demands on the material of job. The size of the conformation corresponds to the height of the cross section enlargement 14, which further facilitates the conformation of the flat tube ends 35 because it is not No considerable extension of the material is necessary. It is important  that the radii between the narrow sides 32 and the wide sides 33 of the tubes 3 are made quite small in the area of the ends of flat tube 35, since through it it rests welding without errors or the sealing in respectively general.

Figures 15-22 refer to other embodiments, in which the flat tubes are made of two pieces. Figures 15 and 16 show a section transverse through two different heat exchangers, in that the difference is that in figure 15 the tubes planes 3 are formed by two identical deformed plates 1 and 2 and in figure 16 have been provided for the formation of the tubes planes 3 respectively two plates 1, 2 deformed so different. The two plates 1 and 2 are assembled by the edge of bilateral union 40 respectively forming a flat tube 3. The flat tubes 3 are stacked and housing 11 is placed on the battery. In addition, the inlet collector tank 21 and the outlet manifold tank 22 are added to opposite ends of the battery, as can be seen in Figures 17-22. Figures 17-22 refer to both figures 15 and 16 explained. In the example according to figures 15, 18, 20 and 22, the junction edge 40 lies respectively on the plane central longitudinal, parallel to the wide sides 33, of the tube plane 3. In the example according to figures 16, 17, 19 and 21, the edge of junction 40 runs outside the central longitudinal plane, to know in the plane of the plate 2, which is only deformed slightly. (Cross section extension 14) Deposits manifolds 21, 22 and housing 11 have at their junction edges receiver moldings 41, whose geometry is made in such a way that each receiving molding 41 may surround the corresponding segment of a joint edge 40, so that there is a possible tight metal joint, in particular a weld joint hint. After you know the heat exchanger, like has been described, has been assembled, is taken to an oven to indirect welding, to carry out all joints in one operation. In European patent application EP 1 376 043 A2 of the same applicant have already been described such unions of the collecting tanks This is referred to in order to save additional accomplishments at this point. There doesn't exist No accommodation, unlike here.

The basic structures described, that is with flat tubes 3 or one piece or two pieces, they allow improvements whose advantages are in the field of heat exchange efficiency. These result from that for the coolant can be created with very simple means a winding flow path through channels 10 of the heat exchanger. In figures 2 and 3 it has been provided for for this purpose, insert an insert 50 of flat design made of very thin sheet, which is equipped with moldings 51 for flow deviation. Corresponding arrows illustrate the flow path, in which the arrows drawn only they serve for greater clarity and not for fixing to a certain principle of flow of passage, for example to countercurrent or in favor of current. Alternatively or additionally it is also possible to perform in the housing 11 moldings 17, which serve the same purpose. This has been indicated by example in figure 12. Some moldings 17 affect the flow in the channel 10 located outside while the other moldings 51 they affect the flow of passage through the channels 10 between the flat tubes 3. Inserts 50 are particularly provided in connection with 3-piece flat tubes welded Autogenous Otherwise, its effect can also be achieved by the directed deformation of the wide sides 33 of the flat tubes 3, which is more easily achievable in particular in flat tubes 3 of two pieces.

In flat tubes 3 of all examples of realization have been introduced interior inserts 5 corrugated with preferably discrete flow passages 25 for the gas escape. The inner inserts 5 extend in the direction longitudinal of the flat tubes 3 approximately throughout its length. In the transverse direction, a usually small part of the complete cross section of the flat tubes 3 for the creation of a gas bypass of escape 4. This is, when it should be planned, always in the cross-section extension area 14 of the tubes planes 3. This type of embodiment of the branch has the advantage that derivation 4, in which it should not exist in the possible no cooling of exhaust gases, it can be isolated very easily, by means of the appeal that the flow passage 25, located next to branch 4, of the insert interior 5 is not crossed by the exhaust gas. This is done by means of a separation plate, not shown, in the tank collector, which has a foot that closes the step. The other details With respect to this they have been described in the patent application European not published above, cited on page 1, to which Reference is made in this regard. The fact that all figures showing the inner inserts 5 show apparently also a derivation 4 is purely casual and not You must indicate that it is essential. It depends more on the application conditions whether a referral is planned or not 4. For example, it has not been planned so far, in the application for industrial vehicles, no exhaust gas bypass, since industrial vehicles are operated only with small interruptions, that is to say in continuous operation. A branch 4 makes particular sense when the operation is associated with constant interruptions, as is often the case the case in cars.

Finally you have to draw attention even to Figure 14. There it is planned, contiguously to the edge of junction 20 of housing 11, a cover cover 60, which has been also fixed with its connecting edge to the section extension cross-section 14. This structuring will possibly be preferred when the cross section extension strip 14 must be located beyond in the direction of the center of the flat tube that shown in figure 10.

The embodiments shown and described show heat exchangers with only one battery of flat tubes 3, consisting of three or four flat tubes 3. How to He has already stated previously, the number of flat tubes 3 for each battery is adjusted according to the objective. In addition there are examples of performance not shown, which have several piles of tubes planes 3.

Claims (16)

1. Heat exchanger, consisting of flat tubes (3) that have wide and narrow sides (33, 32), whose tubes are arranged relatively together forming channels (10), in which for example a gas, such as a Exhaust gas or feed air, flows through the flat tubes (3) and is then cooled through a cooling medium, which flows through the channels (10) between the flat tubes (3), and whose exchanger it has a housing (11) in which a stack of flat tubes (3) is arranged, characterized in that the housing (11) is made as an open profile with two wings (12, 13) having a connecting edge (20), whose housing only surrounds a part of the entire perimeter of the stack (s) of flat tubes (3), in which the flat tubes (3) are kept separate and the channels (10) are closed to the open side and the joining edge (20) is connected to the wide sides (33) or narrow sides (32) of the outer flat tubes. 2. Heat exchanger according to claim 1, characterized in that the housing (11) has a separation on all sides with respect to the perimeter of the battery, such that between the inner side of the housing (11) and the battery there is a channel ( 10). 3. Heat exchanger according to claims 1 or 2, characterized in that the wings (12, 13) extend in the direction of the wide sides (33) of the flat tubes (3) and are joined with the wide sides (33) of the outer flat tubes (3). 4. Heat exchanger according to claims 1, 2 or 3, characterized in that an extension of cross section (14) extending in the longitudinal direction of the flat tubes (3) is provided to maintain the separation, to whose extension they are attached the wings (12, 13) preferably with the wide sides (33) of the flat tubes (3). 5. Heat exchanger according to claim 1 or 4, characterized in that the cross-sectional extension (14) is provided on one or preferably on the wide sides (33) of the flat tubes (3) and extends over a strip over all the length of the flat tubes (3). 6. Heat exchanger according to one of the preceding claims, characterized in that the joint edge (20) is preferably lowered and assumes the joint with the cross-sectional extension (14). 7. Heat exchanger according to one of claims 1-6, characterized in that all flat tubes (3) are made of one piece or two pieces and are arranged one above the other, leaving intermediate spaces forming the channels (10), in which the channels (10) or respectively the intermediate spaces are formed by means that the flat tubes (3) are in contact with each other preferably with their cross-sectional extension (14). 8. Heat exchanger according to claim 7, characterized in that two identical deformed plates (1, 2) are provided in flat tubes (3) of two pieces, in which the channels (10) are formed by the deformation of the plates (1, 2). 9. Heat exchanger according to claim 7, characterized in that, as regards flat tubes (3) made of one piece, they are preferably flat tubes (3) welded by autogenous welding, which have, for example, one of the two narrow sides (32) a longitudinal weld (37), in which the cross-sectional extension (14) is carried out in the course of the manufacture of flat tubes from a sheet metal strip. 10. Heat exchanger, in particular according to claims 1 and 8, characterized in that receiving moldings (41) for receiving the corresponding segment of the other joining edge (40) are provided on the connecting edge (20) of the housing (11). ) of the flat tubes (3) of two pieces. 11. Heat exchanger according to one of the preceding claims, characterized in that there is an inlet manifold and an outlet tank (21, 22) for the gas. 12. Heat exchanger, in particular according to claims 1, 8, 10 and 11, characterized in that also two sides of the joining edge of the collecting tanks (21, 22) are equipped with receiving moldings (41). 13. Heat exchanger according to one of the preceding claims, characterized in that the flat tubes (3) have an inner insert (5). 14. Heat exchanger according to claim 13, characterized in that the inner insert (5) is a corrugated sheet, whose undulations form discrete flow passages (25) for the gas. 15. Heat exchanger according to one of the preceding claims, characterized in that a shunt (4) can be formed in the inlet insert (5) introduced and by means of a separator plate, respectively in the inlet or inlet outlet (21, 22). inside the flat tubes (3). 16. Heat exchanger according to claim 14 and 15, characterized in that at least the flow passage (25), which limits the bypass, of the inner insert (5) is essentially not traversed by the gas, whereby suppresses the passage of heat to the branch (4).